91 lines
1.6 KiB
C
91 lines
1.6 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2007 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gdsroot.h"
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#include "gdskill.h"
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#include "gvcst_kill_sort.h"
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#define S_CUTOFF 15
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void gvcst_kill_sort(kill_set *k)
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{
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block_id_ptr_t stack[50],*sp;
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block_id v,t;
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block_id_ptr_t l,r;
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block_id_ptr_t ix,jx,kx;
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assert(k->used <= BLKS_IN_KILL_SET);
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sp = stack;
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l = (block_id_ptr_t)(k->blk);
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r = l + k->used-1;
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for (;;)
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if (r - l < S_CUTOFF)
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{
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for (ix = l + 1 ; ix <= r ; ix++)
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{
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for (jx = ix , t = *ix; jx > l && *(jx-1) > t; jx--)
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*jx = *(jx - 1);
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*jx = t;
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}
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if (sp <= stack)
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break;
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else
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{
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l = *--sp;
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r = *--sp;
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}
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}
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else
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{
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ix = l;
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jx = r;
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kx = l + ((int)(r - l) / 2);
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kx = (*ix > *jx) ?
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((*jx > *kx) ?
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jx:
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((*ix > *kx) ? kx : ix)):
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((*jx < *kx) ?
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jx:
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((*ix > *kx) ? ix : kx));
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t = *kx;
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*kx = *jx;
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*jx = t;
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ix--;
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do
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{
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do ix++; while (*ix < t);
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do jx--; while (*jx > t);
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v = *ix;
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*ix = *jx;
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*jx = v;
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} while (jx > ix);
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*jx = *ix;
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*ix = *r;
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*r = v;
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if (ix - l > r - ix)
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{
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*sp++ = ix - 1;
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*sp++ = l;
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l = ix + 1;
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}
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else
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{
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*sp++ = r;
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*sp++ = ix + 1;
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r = ix - 1;
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}
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}
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return;
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}
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